... bottom Bolt on the flank Origin Patent Product: Expandable Crowd Control BarrierBrand: MAXPANDModel: B2SMaterial: Steel, Aluminum, Aluminum alloy, ... : 1. Folding and Expanding2. Bolt on the flank3. Original Patent4. OEM AbilityUsage: Using as Isolation, Protection, Caution ... Garden, Plant, Stadium, Airport, Bank, Urgent Construction, Crown Control, and other kinds of urgent service and so on. NEW ...